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CHAPTER 25 CARBOHYDRATES SOLUTIONS TO TEXT PROBLEMS 25.1 (b) Redraw the Fischer projection so as to show the orientation of the groups in three dimensions. HOCH-CHo is equivalent to HOCH, -C--CHO OH Reorient the three-dimensional representation, putting the aldehyde group at the top and the primary alcohol at the bottom. CHO turn90° HOCH,C--CHO CHOH What results is not equivalent to a proper Fischer projection, because the horizontal bonds are n they should be"forward. The opposite is true for the vertical bonds. To make the drawing correspond to a proper Fischer projection, we need to rotate it 180 around a vertical axis CHO CHO HO-C-H is equivalent to HO H,OH CHOH rotate180° Now, having the molecule arranged properly, we see that it is L-glyceraldehyde 701 Back Forward Main Menu TOC Study Guide Toc Student OLC MHHE Website701 CHAPTER 25 CARBOHYDRATES SOLUTIONS TO TEXT PROBLEMS 25.1 (b) Redraw the Fischer projection so as to show the orientation of the groups in three dimensions. Reorient the three-dimensional representation, putting the aldehyde group at the top and the primary alcohol at the bottom. What results is not equivalent to a proper Fischer projection, because the horizontal bonds are directed “back” when they should be “forward.” The opposite is true for the vertical bonds. To make the drawing correspond to a proper Fischer projection, we need to rotate it 180° around a vertical axis. Now, having the molecule arranged properly, we see that it is L-glyceraldehyde. is equivalent to CHO CH2OH HO H CHO CH2OH HO H C CHO CH2OH H OH C rotate 180 H OH HOCH2 C CHO CHO CH2OH H OH C turn 90 is equivalent to H OH HOCH2 CHO OH HOCH2 C H CHO Back Forward Main Menu TOC Study Guide TOC Student OLC MHHE Website
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